JPH0442723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a magnetic head, and more particularly to a magnetic head configured to ensure reliable grounding between a core and a case.

Prior Art A conventional magnetic head of this type was constructed as shown in FIG.

That is, what is indicated by the reference numeral 1 in the figure is a case, and an opening 1a through which the core is exposed is formed on the side of the sliding surface of the magnetic tape.

On the other hand, what is indicated by code 2 is the core assembly.
This core assembly 2 is composed of a pair of left and right core assembly halves 3, 3. The core assembly half 3 includes a core support 4, core halves 5 and 6 supported by the core support 4, and a blocking plate 7 disposed between them.
A coil bobbin 8 is attached between the rear ends of the coil bobbin 6, and a coil 9 is wound around the coil bobbin 8.

Further, a terminal conductor 10 is embedded integrally in the coil bobbin 8.

On the other hand, notches 4a are formed on the upper surface of each of the core supports 4, and a leaf spring 11 bent into a mountain shape is fitted into the notches 4a.

With this leaf spring 11 fitted across the notches 4a, the core assembly 2 is assembled into the case 1.
It is fitted inside, and resin is injected and hardened to integrate it.

This leaf spring 11 serves to ground the core halves 5, 6 and the case 1, and to hold the core assembly 2 within the case 1 by utilizing the elasticity of the leaf spring 11.

Therefore, the core support 4 must be formed from a conductive metal, which increases the cost.

In addition, since a structure is adopted in which the core halves 5 and 6 are in contact with the core support 4, the core support 4 is in contact with the leaf spring 11, and the leaf spring 11 is in contact with the case, there are many contact parts, and naturally There are more chances for defects to occur.

Further, resin has the property of contracting when it hardens, and the leaf spring 11 changes its position along with the contracting resin, often resulting in poor contact.

Purpose The present invention was made in order to eliminate the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic head configured to ensure reliable grounding.

Embodiments Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

First Embodiment FIGS. 2 and 3 illustrate one embodiment of the present invention. In each figure, the same parts as in FIG.

In the figure, the reference numeral 12 is a ground conductor, which is formed by press molding from a metal plate with excellent conductivity, and has an approximately L-shape as a whole. Bent portion 12 at the tip of this ground conductor 12
a is guided to a position where it can come into contact with the core halves 5, 6 and the shielding plate 7, and is fixed to the core halves and the shielding plate by spot welding 13.

On the other hand, the rear conducting portion of the ground conductor 12 is led to the rear of the core support 4, and a folded portion 12b is formed by folding upward at a right angle.

The folded portion 12b is bent so that it can come into contact with the top surface of the case 1 when the core assembly is fitted into the case 1, as shown in FIG.

The folded portion 12b and the case 1 are also fixed by spot welding 13.

Since this embodiment is configured as described above,
The core halves, the blocking plate, and the case can be directly connected by the ground conductor, so that reliable grounding can be achieved.

Second Embodiment FIGS. 4 and 5 illustrate a second embodiment of the present invention, and in both figures, the same parts as in FIG. 1 are given the same reference numerals.

In this embodiment, a ground conductor 14 is used. As shown in FIG. 5, the ground conductor 14 has a bent portion 14a at its tip portion that can come into contact with the core halves 5, 6 and the shielding plate 7, and a folded portion 14b at its rear end portion. However, a chevron-shaped plate spring portion 14c is integrally formed in the central portion.

The bent portion 14a is spot welded to the core halves 5, 6 and the shielding plate 7 as indicated by the reference numeral 15, and the folded portion 14b is spot welded to the case 1 side in the same manner as described above. Fixed.

Since the present embodiment is configured as described above, the core half, the blocking plate, and the case can be directly connected by the ground conductor, and reliable grounding can be achieved. In addition, since the ground conductor 14 has a leaf spring part 14c bent into a chevron shape in the middle (approximately the middle position), when the core assembly is fitted into the case, this leaf spring part 14c
The elasticity of c allows the core assembly to be held elastically within the case. Since the case 1 and the ground conductor 14 are in contact with each other through the leaf spring portion 14c, the grounding can be achieved even more reliably.

As shown in each of the above-mentioned embodiments, it is possible to directly connect the core half or the shield plate to the case via the ground conductor, so a die-cast product is used as the core support 4 as in the past. Instead, it can be integrally molded from synthetic resin, which can significantly reduce costs.

Furthermore, the connection between the ground conductor and the core half, the blocking plate, and the case does not necessarily need to be spot welded, and laser beam welding or other connection methods may be used.

Effects As is clear from the above explanation, according to the present invention, a structure is adopted in which a ground conductor is provided, one end of which is fixed to the core half and the shield plate, and the other end of which is fixed to the case side. , the core halves, the shielding plate, and the case can be directly connected, and reliable grounding can be achieved.

[Brief explanation of drawings]

Figure 1 is an external perspective view explaining the conventional structure, Figure 2
3 and 3 illustrate one embodiment of the present invention, FIG. 2 is a side view of the core assembly half, and FIG. 3 is a side view of the core assembly half.
The figure is a perspective view of the magnetic head assembled.
4 and 5 illustrate another embodiment of the present invention, in which FIG. 4 is a side view of the core assembly half, and FIG. 5 is a perspective view of the ground conductor. 1... Case, 2... Core assembly, 3...
Core assembly half, 4... Core support, 5, 6
... Core half, 7 ... Breaking plate, 8 ... Coil bobbin, 9 ... Coil, 10 ... Terminal conductor, 12, 1
4... Earth conductor.

Claims (1)

[Scope of Claims] 1. In a magnetic head in which a core half and a blocking plate are assembled into a core support to form a core assembly half, and these core assembly halves are butted against each other and fitted and fixed in a case, one end is attached to the core half. A magnetic head characterized in that it is provided with a ground conductor which is fixed to the shielding plate and whose other end is fixed to the case side. 2. The magnetic head according to claim 1, characterized in that a spring portion is formed by bending a substantially middle position of the ground conductor.